I was making an app in android studio and i had no errors. I closed android studio but reopened it because i forgot to do something. when i went into my MainActivity.java i noticed the R was in red and i don't know why
this is the code in my java, it's not like there was something in it:
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class HomeMenu extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home_menu);
}
}
can someone help me ?
Ok, this is what I would do:
Clean the project
Rebuild the project
If that doesn't work, then:
Go to: File -> Invalidate Caches and Restart.
And if the previous option didn't work, then:
Check the package name in the first lines of the java files.
Create a new project and copy the content of your previous project.
Related
I've been trying to get the text field on my first android app lately.
Every time I run the project it shows the same output on the emulator.
Following is the code:
package com.example.demoap;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
Build > Clean project
Build > Rebuild project
then try to run it again.
Or invalidate then do same procedure with clean and rebuild
File > Invalidate Caches / Restart
This thing is also in Ionic when you use in windows
My temporary solution
Simplest way I know this is not a good idea but please unistall before run the app in emulator.
I have never used Android Studio before and have always been coding using NetBeans.
I need to create an app for Android, so I decided to use NetBeans. I created new project and it is 'empty' for now, however I have an error:
package Fridge.Freezer;
import android.app.Activity;
import android.os.Bundle;
public class MainActivity extends Activity
{
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
The error is in setContentView(R.layout.main); - cannot find package. Can anyone tell what I am doing wrong? Clean and build does not work.
erase your package name at the top and try to add it to getting the suggestion package import by shortcut Control + Enter beside "R"
Try checking following component in your project directory
R.java file
folder named layout
layout xml file named main.xmlmain
PS Since your are starting a fresh project, I would suggest you to start at Android Studio.
I tried cleaning the project and rebuilding it again. It did not work. The solution was to restart IDE.
import android.app.Activity;//activity is in red
import android.os.Bundle;//bundle is in red
import android.view.Menu;//menu is in red
import android.view.MenuItem;//Menuitem is in red
import android.widget.Button;//Button is in red
public class MyActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);//OnCreate is in red
//OnCreate is in red
It says it cannot resolve symbol for almost everything!
`
This seems to happen occasionally. Unfortunately, there are only a few things you can do.
First, try to clean the project...(Build -> Clean Project)
That, most likely, won't work. The next step would be to open your SDK manager (3rd button from the right) and download the latest build tools. This is very likely to work.
If that doesn't work, then you may just want to reinstall Android Studio. That's what I had to do two weeks ago.
I am running Eclipse Indigo with Android SDK 4.0.3 and Google API in Linux 11.10. However, when I start up a new Android project, my R.java is no where to be found, hence resulting in the following issue:
package com.lol.asdf;
import android.app.Activity;
import android.os.Bundle;
public class AsdfActivity extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
I have tried all suggestion on this page but it's no good.
Anyone have any ideas?
your R.java is an auto generated class from the res/ folder. Check for error inside it. Try clean and rebuild your project too.
R.java will generated automatically...
first solve all other errors of your project it will be created...
When I try to run the Hello, Android Activity, it says: emulator: ERROR: no search paths found in this AVD's configuration.
And underneath that it says: Weird, the AVD's config.ini file is malformed. Try re-creating it.
I'm stumped and would really appreciate if someone could help me out.
This is what I have for the code:
package my.helloandroid.activity;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class HelloAndroidActivity extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
TextView tv = new TextView(this);
tv.setText("Hello, Android");
setContentView(tv);
}
}
Check the manifest file or look here:
Trouble getting Android emulator to run in eclipse
Three things which came to my mind.
Be sure to check if you have correct path to avd, Window->preferences.
Press right mouse button on your project folder and use android tools -> fix project.
simply restart eclipse.